diff --git a/src/libopensc/asn1.h b/src/libopensc/asn1.h
index 3f981b0c..71a3181c 100644
--- a/src/libopensc/asn1.h
+++ b/src/libopensc/asn1.h
@@ -18,8 +18,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef _SC_ASN1_H
-#define _SC_ASN1_H
+#ifndef _OPENSC_ASN1_H
+#define _OPENSC_ASN1_H
 
 #ifdef  __cplusplus
 extern "C" {
diff --git a/src/libopensc/log.h b/src/libopensc/log.h
index 74716e63..ac769053 100644
--- a/src/libopensc/log.h
+++ b/src/libopensc/log.h
@@ -19,8 +19,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef _SC_LOG_H
-#define _SC_LOG_H
+#ifndef _OPENSC_LOG_H
+#define _OPENSC_LOG_H
 
 #ifdef __cplusplus
 extern "C" {